Dental impression band removing tool



May 8', 1945. I w. w. BAADE 2,375,512"

DENTAL IMPRESSION BAND REMOVING TOOL Filed June 3, 1944 I N V EN TOR. #4104 M50405 nrrakavsr v Patented May 8, 1945 UNITED srAirss' PATENT mm DENTAL memissron BAND REMOVING ,VTOOL William" W. Baade, New York, Y. Application runes, 1944, Serial No. 538,619

2 -Claim s; (o1. s1 5.1) I

The invention herein disclosed relates to the taking of the impressions dental crowns. a U

In taking such impressions, the band or ring carrying the modelingcflm und, has to be forced over the tooth. This causes it tov stick more or less, resulting in the present practice of having to wiggle it one way or another, to loosen it sufficiently to permit its withdrawal from the tooth. The angular motion thus applied in loosening the band'efiects a lateral displacement or offsetting of the impression and these inaccuracies are transferred to and becomepart of the crown.

In addition,the inner edges of the band, where they have been trimmed to fit about the base of necessary for making the tooth; present sharp edges, which many times will cut the dentists fingers when applying the force required to pull the band off the tooth.

These impression bands usually are of soft, thin "copper, readily distorted by the squeezing pressure necessarily exerted by the fingers in loosening and pulling the band off the tooth.

Objects of the present invention are'to provide means in theform of a practical tool for effecting removal of such impression bands and which will accomplish the removal without injuring or impairing either the band or the impression formed within the band.

Other objects are to provide a tool having the characteristics outlined, which will be readily understood and used by dentists and which will be of simple and inexpensive design and construction.

The foregoing and other desirable objects are attained by the novel features of construction, combinations and relations of parts hereinafter described, illustrated by way of example in the accompanying drawing and broadly covered in the claims. r

In the drawing, there is shown a practical and at present preferred embodiment of the invention, but structure may be modified and changed in certain respects, all within the true intent and broad scope of the invention as hereinafter defined and claimed.

Fig. 1- in the drawing is a plan View of the tool as in use for the removal of an impression band.

Fig. 2 is an enlarged. detail view.

As here disclosed, the tool is of the pliers 0r forceps type, embodying pivotally connected crossed handles 5 and 6, but carrying jaws cooperative to accomplish the results above outlined.

Specifically, the jaws or jaw extensions 1 and 8, of the handles are relatively long, thin and tapering, So as to be able to reach all portions of These jaws are shown as. elbowed at 9, to pro.- vide approa'ching or convergent reduced end.por

tions I 0, which by reason of such relation and construction, will freely enter smaller cavital portions of themouth.

The tips of the smaller convergent end portions of the jaws carry oppositely disposed sharply angled inwardly extending points ll, sharp enough to readily penetrate and take hold in the soft metal of the impression bands.

These band penetrating points are shown as relatively short and abruptly tapered, so as to be amply strong enough to bite into the band material and to carry the transverse loadwhich they must sustain in pulling the band longitudinally of the tooth axis.

The intermediate bend or angle in the jaws maintains the substantially straight line relation of the points throughout the normal range of use and provides ample space between the jaws in back of the points to reach over and around adjoining tooth structure.

To prevent penetration beyond that degree where the points will take firm hold on the band and to avoid any possibility of the jaws closing to such an extent as to deform or crush the band or the impression material, stop means are provided, adjustable to instantly set the jaws and hence the points to the proper approach for theparticular band to be gripped and removed.

The stop means illustrated,-comprises simply a fine thread set screw, 12, operating through one of the handles 6, in backof the pivot center and engaging a stop shoulder I3, at the inside ofthe other handle 5. The head H, of this set screw may be disposed so as to be readily accessible and operable at the outside of the mouth.

In use the instrument may be introduced and adjusted through the medium of the set screw 12, to more or less caliper the band I5, in position on the tooth. Then with the assurance that ing pressure to the modeling compound confined v by the wall. Upon attainment of this firm but non-collapsing grip, any necessary force may be applied on the handles to lift the band straight off the tooth. In some cases, a fulcrum'block may, be'slipped under the jaws at a convenient sions and stop means on the handle portionsof place back of the gripping points, to use the tool as a lever, but with the exercise of care to avoid any appreciable lateral movement of the band on ordinarily coming loose freely after this initial releaseJ The measured gripping engagement of the im- 'pression band efiected by the invention provides a quick and convenient means for removing such bands, without injuring or spoiling'impression'sf i ,,and enables better impressionsto.bevtakentbee cause of the fact that the bands can be pressed into place with any force needed to make ya firm, 15

true impression.

What is claimed is: i v

'1. An impression band removing to'ol of'the forceps type and comprising pivoted handlesand connected long, thintapering jaws, said jaws be- Q ing elbovs' 'ed in their intermediate portions and I having at their tip jends laterally xthdihg'oppositely disposed inwardly projecting, rigid tapered points sharp and "strong enough to penetrate the surfaceof band material used for talging impres 25 Usually, a very slight longitudinal 5 movement will be suflicientto start the band, it

the tool in ,back of the jaws and adjustable to set the closing extent of the jawsto that distance where the points will penetrate only sufficiently to take a firm enough grip to enable removal of an impression band by said forceps, without deforming the material of the band.

2. A dental tool for removing impression bands of thin soft copper, without deforming such bands or the contained modeling compound carrying the impressions, said tool comprising long "tapering thin jaws havingoppositely disposed,

laterally extending, inwardly angled rigid sharp copper penetrating points at the ends of the same and handles by which said points maybe sepa- ,ratedandapproached and adjustable stop means back of said jaws for accurately limiting the approach of 'said" points to such extent as will enablemthem to bite into the material only far enough to effect a firm grip sufficient for accomplishing "removal ofthe bands from the teeth Without deforming the bands or the modeling compound within thesame.

WILLIAM WLBAADE. i 

